20 February 2017 Realisation of 3D metamaterial perfect absorber structures by direct laser writing
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Abstract
We report design, fabrication and optical properties of 3D electromagnetic metamaterial structures applicable as perfect absorbers (PA) at mid infra-red frequencies. PA architecture consisting of single-turn metallic helices arranged in a periodic two-dimensional array enables polarization-invariant perfect absorption within a considerable range of incidence angles. The absorber structure is all-metallic, and in principle does not require metallic ground plane, which permits optical transparency at frequencies away from the PA resonance. The samples were fabricated by preparing their dielectric templates using Direct Laser Write technique in photoresist, and metalisation by gold sputtering. Resonant absorption in excess of 90% was found at the resonant wavelength of 7.7 μm in accordance with numerical modelling. Similar PA structures may prove useful for harvesting and conversion of infrared energy as well as narrow-band thermal emission and detection.
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I. Fanyaeu, I. Fanyaeu, V. Mizeikis, V. Mizeikis, } "Realisation of 3D metamaterial perfect absorber structures by direct laser writing", Proc. SPIE 10115, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics X, 101150X (20 February 2017); doi: 10.1117/12.2250449; https://doi.org/10.1117/12.2250449
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